But Nissan did see fit to improve the gearbox on the Zed, twice, afaik. So they didn't get it right first time, maybe the Molyslip addresses some of the short comings of the early box? Also, whilst one respected specialist may not be keen on it, another, Horsham Developments, sell it as part of a gearbox service pack, as does Zmanalex. I have no idea either way and would normally be happy to trust the advice of a respected specialist, but in this instance that doesn't seem to be clear cut.